the romney campaign, more than $20 million. recent polling shows that in three, critical battleground states, president obama's in the lead. but the romney campaign says their internal polling in those states shows a much tighter race. >> they're going to have to plant the flag in ohio and fight like crazy. >> reporter: but romney's path to victory is shrinking. this week, abc news shifted ohio from the toss-up column to ohio. mitt romney would need to win nearly all of the remaining seven toss-up states to win the white house. and they all went for president obama in 2008. karen travers, abc news, washington. >>> we have the most convincing evidence yet that water once flowed on mars. nasa's rover curiosity, beaming back pictures with pebbles that are rounded off. a fast-moving stream once flowed on the red planet. finding past water is the first step to find out if the environment was able to sustain life. >>> time, now, for weather across the nation. heavy downpours and flooding around boston, new york, philly and d.c. thund